Effects of thickness on the cation segregation in epitaxial (001) and (110) La2/3Ca1/3MnO3 thin films

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Title:	Effects of thickness on the cation segregation in epitaxial (001) and (110) La2/3Ca1/3MnO3 thin films
Author:	Estradé Albiol, Sònia; Rebled, J. M. (José Manuel); Arbiol i Cobos, Jordi; Peiró Martínez, Francisca; Infante, I. C.; Herranz, G.; Sánchez, F.; Fontcuberta i Griñó, Josep; Córdoba, R.; Mendis, B. G.; Bleloch, A. L.
Other authors:	Universitat de Barcelona
Abstract:	Electron-energy-loss spectroscopy is used to map composition and electronic states in epitaxial La2/3Ca1/3MnO3 LCMO films of various thicknesses grown on SrTiO3 001 and 110 substrates. For relatively thick films 20 nm , epitaxial tensile strain in 001 films promotes a compositional La/Ca gradient across the film thickness, being the interface La rich, while the relaxed 110 films are chemically homogeneous. In contrast, much thinner 001 and 110 LCMO films display a different La/Ca distribution, being La rich at the free surface. The observed distinct thickness-dependent composition gradient behavior reflects a balance between strain-induced elastic energy minimization and kinetic effects during growth.
Subject(s):	-Cations -Pel·lícules fines -Espintrònica -Espectroscòpia de pèrdua d'energia d'electrons -Cations -Thin films -Spintronics -Electron energy loss spectroscopy
Rights:	(c) American Institute of Physics , 2009
Document type:	Article Article - Published version
Published by:	American Institute of Physics
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